Numbers on GXP cups ??

I have 2 different GXP bottom brackets.

They appear to be the same but have different numbers printed on the drive side cups.
One says 37-05 and the other says 34-06. Both bottom brackets seem to be exactly the same.
Do the different numbers suggest that the specs between the 2 are different.

I thought all Truvativ GXP bottom brackets were the same except that some were available with
ceramic bearings or english or italian threads.
Both of these are not ceramic bearing and have english threads.